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ASHIMA KALRA

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Pseudo code & Algorithm Pseudo code & Algorithm FlowchartsFlowcharts

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A typical programming task can be divided into two phases: Problem solving phase ◦ produce an ordered sequence of steps that describe solution of problem ◦ this sequence of steps is called an algorithm Implementation phase ◦ implement the program in some programming language PROBLEM SOLVING TECHNIQUES BACK

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First produce a general algorithm (one can use pseudocode) Refine the algorithm successively to get step by step detailed algorithm that is very close to a computer language. Pseudocode is an artificial and informal language that helps programmers develop algorithms. Pseudocode is very similar to everyday English. BACK

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Example 1 Write an algorithm to determine a student’s final grade and indicate whether it is passing or failing. The final grade is calculated as the average of four marks.

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Pseudocode: Input a set of 4 marks Calculate their average by summing and dividing by 4 if average is below 50 Print “FAIL” else Print “PASS”

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Detailed Algorithm Step 1: Input M1,M2,M3,M4 Step 2: GRADE (M1+M2+M3+M4)/4 Step 3: if (GRADE < 50) then Print “FAIL” else Print “PASS” endif BACK

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(Dictionary) A schematic representation of a sequence of operations, as in a manufacturing process or computer program. (Technical) A graphical representation of the sequence of operations in an information system or program. Information system flowcharts show how data flows from source documents through the computer to final distribution to users. Program flowcharts show the sequence of instructions in a single program or subroutine. Different symbols are used to draw each type of flowchart. BACK

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A Flowchart ◦ shows logic of an algorithm ◦ emphasizes individual steps and their interconnections ◦ e.g. control flow from one action to the next BACK

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Step 1: Input M1,M2,M3,M4 Step 2 : GRADE :=(M1+M2+M3+M4)/4 Step 3: if (GRADE <50) then Write “FAIL” else Write “PASS” endif START Input M1,M2,M3,M4 GRADE (M1+M2+M3+M4)/4 IS GRADE<5 0 STOP Y N WRITE PASS WRITE FAIL BACK

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Write an algorithm and draw a flowchart to convert the length in feet to centimeter. Pseudocode: Input the length in feet (Lft) Calculate the length in cm (Lcm) by multiplying LFT with 30 Print length in cm (LCM)

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Algorithm Step 1: Input Lft Step 2: Lcm Lft x 30 Step 3: WRITE Lcm START Input Lft Lcm Lft x 30 STOP Flowchart WRITE LCM BACK

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Write an algorithm and draw a flowchart that will read the two sides of a rectangle and calculate its area. Pseudocode Input the width (W) and Length (L) of a rectangle Calculate the area (A) by multiplying L with W Print A

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Algorithm Step 1: Input W,L Step 2: A L x W Step 3: WRITE A START Input W, L A L x W STOP WRITE A BACK

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Write an algorithm that reads two values, determines the largest value and prints the largest value with an identifying message. ALGORITHM Step 1: Input VALUE1, VALUE2 Step 2: if (VALUE1 > VALUE2) then MAX VALUE1 else MAX VALUE2 endif Step 3: Write“The largest value is”, MAX BACK

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MAX VALUE1 STOP YN START Input VALUE1,VALUE2 MAX VALUE2 is VALUE1>VALUE2 WRITE MAX BACK

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